Diamond Cutting Tool and Manufacturing Method Thereof

ABSTRACT

A manufacturing method of a diamond cutting tool is characterized in that the metal coated diamond particles are arranged on a region of a steel body portion intended to be used as a cutting edge, and then adhered to the body portion through the electro-deposition whereby the manufacturing time is reduced, the diamond particles are securely adhered to the body portion, and the lifetime of the cutting tool is prolonged as well.

TECHNICAL FIELD

The present invention relates to a diamond cutting tool and a manufacturing method thereof, and more particularly to diamond cutting tool which can be shortened in manufacturing time and prolonged in lifetime and a manufacturing method thereof.

BACKGROUND ART

In general, the diamond cutting tool has been used as a cutting tool for cutting a hard material such as stone, metal, concrete, and the like in the construction field or engineering works.

As a manufacturing method of the diamond cutting tool, there has been known a method in which a plurality of cutting segments that is manufactured by a blending, a forming, and a sintering of diamond particles and metal powders is welded around a body portion made of a high speed tool steel such as a carbon tool steel, a low carbon steel, and the like.

However, in such welding method, the processes of blending, forming, and sintering and the welding process for the cutting segments should be independently performed in the separate devices. This causes a problem of complicated manufacturing process so that manufacturing cost and time are increased.

In order to solve this problem, it has been developed an electro-deposition process by which diamond particles are deposited around the steel body portion.

FIGS. 1 to 3 show a conventional manufacturing method for cutting tools according to such electro-deposition process. First, as shown in FIG. 1, it is performed to arrange diamond particles 2 on a disc type steel body portion 1. Then, as shown in FIG. 2, it is performed to immerse the body portion 1 on which diamond particles 2 are arranged in a plating bath 3 filled with an electrolyte 5 such that a metal plate 4 installed in the plating bath 3 is positive-biased and the body portion 1 is negative-biased. Herein, the metal plate 4 is composed of a metal to be electro-deposited between the diamond particles 2 and the body portion, for example, Ni, Cu, Co, and so on, and the electrolyte 5 is a solution containing metal ions forming the metal plate 4.

As set forth before, when the body portion 1 is negative-biased and the metal plate 4 is positive-biased, the metal ions contained in the electrolyte 5 are reduced and precipitated on the negative-biased body portion 1. Although the metal ions in the electrolyte are exhausted through the precipitation, other metal ions are continuously supplied therein from the metal plate 4 through electrolysis, thereby acting on the reaction continuously. With the procedure of such reaction taking a sufficient time, as shown in FIG. 3, the diamond particles 2 are adhered to the body portion 1 through the electro-deposited metal 7.

However, according to this conventional manufacturing method, there was a problem in that it takes so much plating time in order to thicken a plating thickness for secure adhesion of the diamond particles. In addition, according to the conventional manufacturing method, there was another problem in that the diamond particles are moved to be in disarray in the course of electro-deposition of the diamond particles after the arrangement of the diamond particles on the body portion.

DISCLOSURE OF INVENTION Technical Problem

Accordingly, the present invention has been made to solve the above-mentioned problems occurring in the prior art, and an object of the present invention is to provide a diamond cutting tool in which the diamond particles are securely adhered to a disc type body portion and a manufacturing time is shortened, and a manufacturing method thereof.

Another object of the present invention is to provide a diamond cutting tool in which the diamond particles are coated with magnetic metal and a body portion is magnetized so that the diamond particles coated with metal are fixed to the magnetized body portion through a magnetic force therebetween, thereby preventing the diamond particles from being in disarray, and a manufacturing method thereof.

Still another object of the present invention is to provide a diamond cutting tool in which the diamond particles coated with metal are arranged in multi-layer using a magnetic force and electro-deposited on a body portion, thereby prolonging a lifetime of the cutting tools, and a manufacturing method thereof.

Technical Solution

In order to accomplish the above objects, there is provided a method for manufacturing a diamond cutting tool, comprising the steps of:

coating the diamond particles with metal;

arranging the metal coated diamond particles on a region of a steel body portion intended to be used as a cutting edge;

immersing the body portion in a plating bath filled with an electrolyte; and

performing the electro-deposition in such a manner that the body portion is negative-biased and a separate metal plate installed in the plating bath for plating is positive-biased, thereby adhering the metal coated diamond particles to the body portion.

The diamond particles may be arranged in multi-layer and electro-deposited so that the diamond particles are thickened to prolong a lifetime of the cutting tool.

The metal coating the diamond particles may be iron or cobalt with excellent magnetic property. In case where the diamond particles are coated with the metal with excellent magnetic property, when the metal coated diamond particles are arranged on the body portion, the diamond particles can be fixed to the body portion by a magnetic force generated between the metal coating layer and the body portion through magnetization of the body portion.

In the mean time, the diamond particles may be coated with metal by means of electro-deposition or fusion welding.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other objects, features and advantages of the present invention will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which:

FIG. 1 is a view showing a state in which the diamond particles are arranged on a body portion according to a conventional method of manufacturing a cutting tool;

FIG. 2 is a view showing a state in which the body portion on which the diamond particles of FIG. 1 are arranged is immersed in a plating bath;

FIG. 3 is a sectional view of the cutting tool electro-deposited with the diamond particles according to the conventional method of manufacturing the cutting tool;

FIG. 4 is a flow chart showing a manufacturing method for a diamond cutting tool according to a preferred embodiment of the present invention;

FIG. 5 is a perspective view of a diamond particle coated with metal according to the present invention;

FIG. 6 is a view showing a state in which the diamond particles coated with metal are arranged on a body portion according to the present invention;

FIG. 7 is a view showing a state in which the body portion on which the diamond particles coated with metal are arranged is immersed in a plating bath according to the present invention;

FIG. 8 is a sectional view of the cutting tool electro-deposited with the diamond particles coated with metal according to the present invention; and

FIG. 9 is a sectional view showing a cutting tool according to another preferred embodiment of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 4 is a flow chart showing a manufacturing method for a diamond cutting tool according to a preferred embodiment of the present invention. As shown in FIG. 4, the manufacturing method for a diamond cutting tool according to the present invention comprises the steps of coating the diamond particles with metal (S410), arranging the metal coated diamond particles on a body portion (S430), and electro-depositing the diamond particles on the body portion (S450).

Description will be made in detail to the steps of the manufacturing method for the diamond cutting tool according to the present invention.

FIG. 5 is a perspective view of a diamond particle 20 coated with metal 22. As shown in FIG. 5, for manufacturing the diamond cutting tool, a worker first coats the outer surfaces of the diamond particles 20 with metal to form a metal coating layer 22 (S410). As the coating method for the diamond particles 20, various coating technologies can be used, such as electro-deposition or fusion welding, for example. That is, there can be used the electro-deposition method in which the surfaces of the diamond particles 20 are coated with metal by means of electroplating through a separate electro-deposition process, or the fusion welding method in which the metal to be coated is fused and welded on the surfaces of the diamond particles 20.

The metal constituting the metal coating layer 22 may be a metal with excellent magnetic property, for example, iron (Fe), cobalt (Co) and the like. When the diamond particles are coated with the metal with excellent magnetic property and a body portion 10 (See FIG. 6) is magnetized, metal coated diamond particles 20 can be fixed to the body portion 10 while being arranged thereon by means of a magnetic force between the metal coating layer 22 and the body portion 10. When the diamond particles 20 are fixed like this, the diamond particles maintain their original positions without being moved even when the body portion 10 is moved for plating or even in the course of plating. While the above description has been made for the coating metal such as Fe and Co, the magnetic metal is not limited thereto, but other proper metals may be adopted by persons with ordinary knowledge in the art to which the present invention pertains.

FIG. 6 is a view showing a state in which the diamond particles 20 coated with metal are arranged on the body portion 10 (S430).

A worker coats the diamond particles 20 and arranges the diamond particles coated with the metal coating 22 on the surface of the disc type body portion 10 forming a cutting edge. At this time, in order to maintain cutting performance of the cutting tool constantly, it is preferable to arrange the diamond particles 20 at regular intervals.

When the diamond particles 20 are arranged like this, as set forth before, the body portion 10 is magnetized and then the diamond particles 20 are arranged. There may be used various methods for magnetizing the body portion 10. For example, when a permanent magnet is attached to the body portion 10, the body portion 10 is magnetized by the magnetic force of the permanent magnet, having a magnetic property. Like this, the diamond particles 20 are fixed to the body portion 10 by means of a magnetic force generated between the magnetized body portion 10 and the metal coating 22 surrounding the diamond particles 20. In this way, if the diamond particles 20 are arranged and fixed by means of a magnetic force, they are not moved even in the course of plating, thereby manufacturing a cutting tool with the diamond particles 20 arranged at regular intervals.

After the arrangement of the diamond particles 20, the worker immerses the body portion 10 on which the diamond particles 20 are arranged in a plating bath 30 to electro-deposit the diamond particles 20 as shown in FIG. 7 (S450).

The worker immerses the body portion 10 on which the diamond particles are arranged and a pair of metal plates 32 in the plating bath 30 filled with an electrolyte 34. Herein, the material of the metal plate 32 may be a metal to which the diamond particles 20 are intended to be electro-deposited, such as, for example, Ni, Cu, Co, and the like.

In the mean time, the electrolyte 34 is composed of a solution containing the same metal ions as the metal plate 32. When the metal ions contained in the electrolyte 34 are electro-deposited and precipitated, the metal ions are supplied to the electrolyte 34 through the electrolysis of the metal plate 32. Therefore, the electro-deposition process of the metal ions may be continued so that the plating process of the metal coated diamond particles 20 is performed.

After the body portion 10 and the metal plate 32 are immersed in the plating bath 30, the metal plate 32 is applied with a positive bias and the body portion 10 on which the diamond particles 20 are arranged is applied with a negative bias. With the application of bias, the metal ions such as Ni, Cu, Co, and the like contained in the electrolyte 34 are reduced and precipitated at the negative-biased body portion 10. The metal ions are continuously precipitated at the body portion 10 by the reduction reaction so that the diamond particles 20 arranged on the body portion 10 are bonded to the body portion 10 while being plated by the precipitated metal. Meanwhile, when t he plating of the diamond particles 20 is completed, the body portion 10 is picked out from the plating bath 30 to dry. In this case, if a permanent magnet (not shown) is attached to the body portion 10 to magnetize the same, the permanent magnet is removed and then the body portion 10 is dried.

FIG. 8 is a sectional view of the cutting tool electro-deposited with the diamond particles according to the above-mentioned method. As shown in FIG. 8, the diamond particles 20 coated with metal 22 are fixed to the body portion 10 by the plating layer 24. According to the present invention, the plating is performed after the diamond particles 20 are coated with the metal coating 22 so that the thickness of the electro- deposited layer surrounding the diamond particles 20 is equal to the combination of the thicknesses of the metal coating 22 and the plating layer 24. Accordingly, the thickness of the electro-deposited layer surrounding the diamond particles 20 can be made sufficient without thickening the plating layer with a long time plating process, thereby prolong the lifetime of the cutting tool considerably.

FIG. 9 is a sectional view showing a cutting tool according to another preferred embodiment of the present invention. In the drawing, it is illustrated that the diamond particles 20 are electro-deposited on only one side of the body portion 10 for convenience of description.

Referring to FIG. 9, according to this embodiment, the diamond particles 20 coated with the metal coating 22 are arranged in multi-layer on the body portion 10 and it is performed an electro-deposition process. If the body portion 10 is magnetized, since the metal to be coated on the diamond particles 20 has a magnetic property, it is possible to arrange the diamond particles in multi-layer by means of the magnetic force between the metal coating 22 and the body portion 10. In this way, when the diamond particles 20 are arranged in multi-layer and the plating is performed, it can be obtained a cutting tool on which the diamond particles 20 are arranged in multi-layer as shown in FIG. 9. In this embodiment, the diamond particles 20 are arranged in multi-layer so that even though the utmost upper diamond layer is worn out by the cutting work, the cutting work can be done by the next lower diamond layer. Accordingly, through the arrangement of the diamond particles in multi-layer, the lifetime of the cutting tool can be further increased.

INDUSTRIAL APPLICABILITY

As set forth above, according to a manufacturing method for diamond cutting tool, the diamond particles are coated with metal and then electro-deposited with the plating so that the plating time can be reduced and the diamond particles can be securely attached to the body portion as well.

In addition, according to the present invention, the diamond particles are coated with magnetic metal and the body portion is magnetized so that it is possible to arrange the metal coated diamond particles in multi-layer on the body portion by means of the magnetic force and to electro-deposit the same, thereby prolong the lifetime of the cutting tool.

In addition, according to the present invention, the diamond particles are coated with magnetic metal and the body portion is magnetized so that it is possible to arrange the metal coated diamond particles on the body portion by means of the magnetic force thus to fix the same without movement in the course of the manufacturing process.

Although preferred embodiments of the present invention have been described for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. 

1. A method for manufacturing a diamond cutting tool, comprising the steps of: coating the diamond particles with metal; arranging the metal coated diamond particles on a region of a steel body portion intended to be used as a cutting edge; immersing the body portion in a plating bath filled with an electrolyte; and performing the electro-deposition in such a manner that the body portion is negative-biased and a separate metal plate installed in the plating bath for plating is positive-biased, thereby adhering the metal coated diamond particles to the body portion.
 2. The method as claimed in claim 1, wherein the diamond particles are arranged in multi-layer and electro-deposited.
 3. The method as claimed in claim 1, wherein the metal coating the diamond particles is iron or cobalt with excellent magnetic property.
 4. The method as claimed in claim 3, wherein when the metal coated diamond particles are arranged on the body portion, the diamond particles are fixed to the body portion by a magnetic force generated between the metal coating layer and the body portion through magnetization of the body portion.
 5. The method as claimed in claim 1, wherein the diamond particles are coated with metal by means of electro-deposition or fusion welding.
 6. A diamond cutting tool manufactured by the method of claim
 1. 7. A diamond cutting tool manufactured by the method of claim
 4. 